Gabrić Domagoj, Kurek Mia, Ščetar Mario, Brnčić Mladen, Galić Kata
Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, HR-10000 Zagreb, Croatia.
Polymers (Basel). 2023 Jun 2;15(11):2569. doi: 10.3390/polym15112569.
This research was aimed to make biolayer coatings enriched with orange peel essential oil (OPEO) on synthetic laminate, oriented poly(ethylene-terephthalate)/polypropylene (PET-O/PP). Coating materials were taken from biobased and renewable waste sources, and the developed formulation was targeted for food packaging. The developed materials were characterized for their barrier (O, CO, and water vapour), optical (colour, opacity), surface (inventory of peaks by FTIR), and antimicrobial activity. Furthermore, the overall migration from a base layer (PET-O/PP) in an acetic acid (3% HAc) and ethanol aqueous solution (20% EtOH) were measured. The antimicrobial activity of chitosan (Chi)-coated films was assessed against . Permeation of the uncoated samples (base layer, PET-O/PP) increased with the temperature increase (from 20 °C to 40 °C and 60 °C). Films with Chi-coatings were a better barrier to gases than the control (PET-O/PP) measured at 20 °C. The addition of 1% (/) OPEO to the Chi-coating layer showed a permeance decrease of 67% for CO and 48% for O. The overall migrations from PET-O/PP in 3% HAc and 20% EtOH were 1.8 and 2.3 mg/dm, respectively. Analysis of spectral bands did not indicate any surface structural changes after exposure to food simulants. Water vapour transmission rate values were increased for Chi-coated samples compared to the control. The total colour difference showed a slight colour change for all coated samples (ΔE > 2). No significant changes in light transmission at 600 nm for samples containing 1% and 2% OLEO were observed. The addition of 4% (/) OPEO was not enough to obtain a bacteriostatic effect, so future research is needed.
本研究旨在在合成层压板定向聚（对苯二甲酸乙二酯）/聚丙烯（PET-O/PP）上制备富含橙皮精油（OPEO）的生物层涂层。涂层材料取自生物基和可再生废物源，所开发的配方目标用于食品包装。对所开发的材料进行了阻隔性能（氧气、二氧化碳和水蒸气）、光学性能（颜色、不透明度）、表面性能（傅里叶变换红外光谱峰清单）和抗菌活性表征。此外，还测量了基层（PET-O/PP）在乙酸（3% HAc）和乙醇水溶液（20% EtOH）中的总迁移量。评估了壳聚糖（Chi）涂层薄膜对……的抗菌活性。未涂层样品（基层，PET-O/PP）的渗透率随温度升高（从20℃至40℃和60℃）而增加。在20℃下测量时，含Chi涂层的薄膜对气体的阻隔性优于对照（PET-O/PP）。在Chi涂层中添加1%（/）的OPEO后，二氧化碳的渗透率降低了67%，氧气的渗透率降低了48%。PET-O/PP在3% HAc和20% EtOH中的总迁移量分别为1.8和2.3 mg/dm²。光谱带分析表明，暴露于食品模拟物后表面结构没有任何变化。与对照相比，含Chi涂层样品的水蒸气透过率值有所增加。所有涂层样品的总色差显示有轻微颜色变化（ΔE＞2）。对于含有1%和2% OLEO的样品，在600 nm处的透光率未观察到显著变化。添加4%（/）的OPEO不足以获得抑菌效果，因此需要未来的研究。
